 His research thus rendered a good deal of "known" Gascon and Navarrese genealogy meaningless.Among the many otherwise unattested claims of the "Charte" are the descent of the dukes of Aquitaine and Gascony from the Merovingian king Charibert II.The younger sons, if there were younger sons, of Charibert are in fact unknown; as is the parentage of Odo the Great.